Here is the full list of all 42 Ghost Song achievements.
Help your friends escape.
Complete the game on Original difficulty.
Defeat a Big Bot.
Receive a special gift from Molly.
Once again, help to repair Gambler.
Fully repair Gambler.
Reach Mabec.
Continue to assist in the repair of Gambler.
Defeat Henriette again.
Bring a third part to Gambler.
Reach level 30.
Locate many Big Bots.
Defeat Vek.
Obtain many Healing Cores.
Help to repair Gambler again.
Defeat Dolly.
Help to repair Gambler.
Defeat Elsom.
Defeat many enemies.
Defeat Henriette...
Defeat Kika.
Arrive at the crash site.
Defeat Old Singer.
Defeat Kellunhelk.
Obtain many modules.
Obtain many weapons.
Visit The Cut Machine.
Spend time with Pasha.
Find Charley.
Get to know Saymund.
Say goodbye to Mutt.
Get to know the crew.
Have a chat with Relic.
Help Gili.
Heal yourself many times.
Destroy many Roslock creatures in the pit.
Do a killer Painwheel juggle.
Destroy many innocent creatures.
Complete the game without dying.
Show off with flowers.
Push the large piece of junk down the hill.
Finish the game in under 3 hours.